package com.cos.lession69.util;

import org.apache.ibatis.io.Resources;
import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.session.SqlSessionFactoryBuilder;

import java.io.IOException;
import java.io.InputStream;

/**
 * @author: COS
 * @time: 2022/9/23 9:38
 * @description:
 */
public class MybatisUtil {
    private static SqlSessionFactory factory ;
    public static final ThreadLocal<SqlSession> THREAD_LOCAL = new ThreadLocal<>();

    static {
        try {
            InputStream is = Resources.getResourceAsStream("mybatis-config.xml");
            factory = new SqlSessionFactoryBuilder().build(is);
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    public static <T> T getMapper(Class<T> clazz){
        SqlSession session = getSession();
        return session.getMapper(clazz);
    }

    public static SqlSession getSession(){
        SqlSession session = THREAD_LOCAL.get();
        if (session == null) {
            session=factory.openSession();
            THREAD_LOCAL.set(session);
        }
        return session;
    }

    public static SqlSession openSession(){
        return factory.openSession();
    }


    public static void close(SqlSession session){
        session.close();
        THREAD_LOCAL.remove();
    }

    public static void commit(){
        SqlSession session = getSession();
        session.commit();
        close(session);
    }
    public static void rollback(){
        SqlSession session = getSession();
        session.rollback();
        close(session);
    }


}
